Campus Units

Physics and Astronomy, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

3-21-2010

Journal or Book Title

Philosophical Magazine

Volume

90

Issue

9

First Page

1219

Last Page

1227

DOI

10.1080/14786430903325041

Abstract

We report anisotropic thermal expansion of the parent, AEFe2As2 (AE = Ba, Sr, and Ca), compounds. Above the structural/antiferromagnetic phase transition anisotropy of the thermal expansion coefficients is observed, with the coefficient along the a-axis being significantly smaller than the coefficient for the c-axis. The high temperature (200 K ≤ T ≤ 300 K) coefficients themselves have similar values for the compounds studied. The sharp anomalies associated with the structural/antiferromagnetic phase transitions are clearly seen in the thermal expansion measurements. For all three pure compounds, the ‘average’ a-value increases and the c-lattice parameter decreases on warming through the transition, with the smallest change in the lattice parameters observed for SrFe2As2. The data are in general agreement with the literature data from X-ray and neutron diffraction experiments.

Comments

This article was published by Taylor & Francis as Bud'ko, Sergey L., Ni Ni, and Paul C. Canfield. "Anisotropic thermal expansion of AE Fe2As2 (AE= Ba, Sr, Ca) single crystals." Philosophical Magazine 90, no. 9 (2010): 1219-1227. DOI: 10.1080/14786430903325041.

Rights

This work is published by permission of the US Department of Energy under Contract No. DE-AC02-07CH11358. The US Government retains for itself, and others acting on its behalf, a paid-up, non-exclusive, and irrevocable worldwide licence in said article to reproduce, prepare derivative works, distribute copies to the public, and perform publicly and display publicly, by or on behalf of the government.

Language

en

File Format

application/pdf

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